X^2-81/x^3+18x^2+81x при x=-8

Question

X^2-81/x^3+18x^2+81x при x=-8

Comments

X^

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x2-81:x3+18x2+81x при х=-8

Answer 1

(x²-9²)/x³+18x²+81x)=
(x-9)(x+9)÷x(x²+18x+81)=
(x-9)(x+9)÷x(x+9)²=(x-9)÷x(x+9)=
(-8-9)÷-8×(-8+9)=
-17÷-8=
2.125